the new owner wanted new spark plugs and gave me his old ones because I thought some still had some life. three of the eight failed the resistance check.
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before cleaning
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after cleaning
annealing copper
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after resistance check

RV9A, Superior O-320, WW 200RV prop, Slick mags, CHT 330F, EGT 1300F, B&C, 1400+ hours
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